While we're sharing our seed storage ideas, I'll share mine. I had an old under bed storage tote that I decided to use for seeds. Then had to expand thanks to seed saving lol. Most are now getting too old to swap so last year I started my seed list with everything older than 2018. This year I'll plant everything older than 2020, then hopefully get my hoard down to a manageable level.
But I use cereal & cracker boxes cut down. Prefer Velveeta boxes because they're heavier cardboard & don't have writing on them. But family size Lucky Charms are perfect for those 2"x3" baggies upright, while pop tart boxes fit them perfectly longwise.